package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Resource
    private DishMapper dishMapper;

    @Resource
    private DishFlavorMapper dishFlavorMapper;

    @Resource
    private SetmealDishMapper setmealDishMapper;
    /**
     * 新增菜品和口味数据
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        //向菜品表插入1条菜品信息
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        Long id = dish.getId();


        //向口味表插入多条口味信息
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors!=null&&flavors.size()>0){
            flavors.forEach(item->{
                item.setDishId(id);
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //开启分页查询
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());

        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 菜品的批量删除
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断是否是起售中的菜品---不能删除
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus()== StatusConstant.ENABLE){
                //当前菜品处于在售状态,不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //被套餐管理的菜品不能删除
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds!=null&&setmealIds.size()>0){
            //当前菜品被套餐关联了,不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }


        /*for (Long id : ids) {
            dishMapper.deleteById(id);

            //关联的口味数据也需要删除
            dishFlavorMapper.deleteByDishId(id);
        }*/
        //删除菜品后
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品信息
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据菜品id查询菜品数据
        Dish dish = dishMapper.getById(id);


        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavorList = dishFlavorMapper.getByDishId(id);

        //封装到DishVO中
        DishVO dishVO=new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavorList);

        return dishVO;
    }

    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        //修改菜品信息
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);

        //修改对应的口味配置信息(先删后增)
        dishFlavorMapper.deleteByDishId(dish.getId());
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors!=null&&flavors.size()>0){
            flavors.forEach(item->{
                item.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
